How works the dialplan-pattern in CME for direct versus redirect?

[cjrchoi11]

I configured CUE in CME and have a question how works direct versus redirect to access the CUE voicemail number. choose dial-peer 9000 when direct access the CUE from ephone but 9001 when call-forward. looks the direct is not using dialplan-pattern. Can I get an explanation why work like this?

telephony-service

dialplan-pattern 1 416737.... extension-length 4 no-reg

!

dial-peer voice 9000 voip

destination-pattern 4211

session protocol sipv2

...

!

dial-peer voice 9001 voip

destination-pattern 4167374211

session protocol sipv2

...

Thanks in advance,

[yshraybman]

This is from CME 4.0 guide

In networks that have a single router, you do not need to use the dialplan-pattern command.

In networks with multiple routers, you may need to use the dialplan-pattern command to expand

extensions to E.164 numbers because local extension numbering schemes can overlap each other.

Networks with multiple routers have authorities such as gatekeepers that route calls through the network.

These authorities use require E.164 numbers so that all numbers in the network will be unique. The

dialplan-pattern command expands extension numbers into unique E.164 numbers for that use.

There is more in CME 4.0 guide.